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aspmx1.migadu.com; dkim=fail ("headers rsa verify failed") header.d=tobias.gr header.s=2018 header.b="jxiFuFS/"; dmarc=pass (policy=none) header.from=gnu.org; spf=pass (aspmx1.migadu.com: domain of "bug-guix-bounces+larch=yhetil.org@gnu.org" designates 209.51.188.17 as permitted sender) smtp.mailfrom="bug-guix-bounces+larch=yhetil.org@gnu.org" X-Migadu-Spam-Score: -3.94 Authentication-Results: aspmx1.migadu.com; dkim=fail ("headers rsa verify failed") header.d=tobias.gr header.s=2018 header.b="jxiFuFS/"; dmarc=pass (policy=none) header.from=gnu.org; spf=pass (aspmx1.migadu.com: domain of "bug-guix-bounces+larch=yhetil.org@gnu.org" designates 209.51.188.17 as permitted sender) smtp.mailfrom="bug-guix-bounces+larch=yhetil.org@gnu.org" X-Migadu-Queue-Id: 79CFC28327 X-Spam-Score: -3.94 X-Migadu-Scanner: scn0.migadu.com X-TUID: QQ5tfL9YsLqt > can I express "any version of ffmpeg"? No, this would go against the goals of Guix: packages can't depend on prop= erties of the environment they'll end up in (if any)=2E They must be self-contained, or use standard features like $PATH et al to = find optional dependencies at run time, but these will have to be provided = by the user/manifest/whatever=2E Sorry, T G-R Sent on the go=2E Excuse or enjoy my brevity=2E